Early Taisho period.
Born as the son of a concubine to the prestigious Todo family, Yuu was oppressed and treated like a slave from an early age.
In particular, her older half-sister, Nadeshiko, pretends to be friends with Yuu in front of Shinnosuke, who likes her, but bullies Yuu thoroughly behind her back. was.
Yuu wishes to be free someday, but cannot do so because she cannot abandon her mother who is imprisoned in her cell.
One day, her mother dies in a fire of unknown cause, and her girlfriend, Yuu, who goes to help her, also disappears.

• Seven years later, Yuu, who was thought to have lost any news of her, grew up to be as beautiful as a different person, changed her name to Haruhi, and returned to the Todo family, where she was killed. With his mother's death in his heart, he begins to take revenge on her.